Light emitting display apparatus

Abstract

A light emitting display apparatus includes a substrate which includes a first area and a second area, an insulating layer on the substrate and having an uneven surface, a first bank on the insulating layer in the second area and formed of a black material, a first electrode on the insulating layer in the first area where the first electrode covers at least a part of a side surface of the first bank, a light emitting layer on the first electrode, and a second electrode on the light emitting layer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of Korean Patent Application No. 10-2018-0103245 filed on Aug. 31, 2018, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference into the present application.BACKGROUNDField[0002]The present disclosure relates to a light emitting display apparatus, and more particularly, to a light emitting display apparatus with an improved light extracting efficiency and an improved outdoor visibility.Description of the Related Art[0003]Currently, in a full-scale information era, a field of display apparatuses which visually express electrical information signals has been rapidly developed and studies have continued in order to improve performances of various display apparatuses such as thin-thickness, light weight, and low power consumption.[0004]Among various display apparatuses, a light emitting display apparatus is a self-emitting display apparatus where a separate ...

AI Technical Summary

Benefits of technology

[0007]The inventor of the present disclosure invented a light emitting display apparatus with a new structure which reduces the surface plasmon loss, among various losses which degrade the light extraction efficiency.

Problems solved by technology

However, some of the light emitted from the light emitting layer may not be output to the outside of the light emitting display apparatus but may be confined inside the light emitting display apparatus so that the light extraction efficiency of the light emitting display apparatus becomes an issue.

For example, there is a problem in that some light among the light emitted from the light emitting layer is confined in the light emitting display apparatus due to a total reflection loss, a waveguide loss, and a surface plasmon loss.

The waveguide loss refers to degradation of light extraction efficiency due to the light confined therein because of the total reflection at the interface of components in the light emitting display apparatus.

The surface plasmon loss occurs when the light vibrates free electrons of the metal surface due to a phenomenon that light is absorbed onto a metal surface during a process of entering and propagating the light so that the light cannot be reflected or transmitted which degrades the light extraction efficiency.

In the meantime, the inventor of the present disclosure found out that when the light emitting device is formed to be uneven, there is a problem in that scattering reflectance in an off-state of the light emitting display apparatus is increased so that a visual feel in an off-state, that is, a black luminance can be degraded and thus not only the outdoor visibility, but also the contrast ratio can be degraded.

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